Yesterday I came back to the boat after 6 weeks and I discovered that my batteries have lost 214 Ah of capacity.The voltage was 11.8 V. My Victron battery controller showed 0.00 A current. When I left the boat 6 weeks before the main switch was off and the victron showed also 0.00 A. In the mean time the victron registered the loss of 214 Ah. How can this happen? I know that the VHF works without the main switch and the light at the entrance. Both were off. Is there any other part consuming electricity? Has anybody made a similar experience?

Your bilge pump/s are connected straight to your power source and will run with all battery switches turned off. Could you have had water in the boat? Have you check the bilges? Check the bilge pumps are able to run by moving the float switches. If they don't run they may have had a fault and kept running until they burnt out?

I got my batteries drained completely on 445 once when leaving the boat I closed all secocks and coming back I found that aircon condensation sump pump was wired around the kill switch and so kept going pushing water into closed seacock until the juice ran out from the service bank. 750 Eur lesson right there.

Ive just had to replace my AGM batteries. They were 5 years old and I found that when they were left with no charging sources connected they would self discharge at an alarming rate.

When I got the batteries tested at full charge one was at 35 amp hours and one at 41. Both are 165ah batteries. This all happened very fast, not a slow deterioration at all. So it may pay to check your battery health.

Failing that. Find the shunt for the battery controller. Are there any other negative sources connected before the shunt on the battery side? There shouldn't be, because if there are their current wont be measured on the controller. The battery will drain but the meter will just show 0 amps.

Hi Alex, yes unfortunately, I found out the hard way. When I connected shore power the first buzz I heard was the aircon sump pump helplessly trying to pump the water through the seacock I closed myself 2 weeks earlier. That happened last year so the scar on my heat healed )))As for the batteries I now run "dead-cell test" regularly to check if I have a faulty cell in the batteries developing. Google it or look here https://www.aussiebatteries.com.au/blog/how-to-troubleshoot-deep-cycle-battery-issues/

Hi...i got a new charger installed and the installer did not put the settings
via laptop for battery type etc, but I do not believe that this is the
reason as they were not "cooked". Maximum charging is 14.5 Volt which is
line for AGMs. Now the charger goes to absorption and float within
minutes. As we have no shore power I can not use the float for a couple
of hours to see if they fully charge.

Question: Are the forward and aft bilge pump inside the plastic box for the Air Conditioner condensation? One of my units won't stop running when I turn the DC panel on and there is no water in the box?? Thanks for any help Joe

You cannot post new topics in this forumYou cannot reply to topics in this forumYou cannot delete your posts in this forumYou cannot edit your posts in this forumYou cannot create polls in this forumYou cannot vote in polls in this forum